Business and Professions Code § 1935

If not renewed, a license issued under the provisions of this article, unless specifically excepted, expires at 12 midnight on the last day of the month of the legal birth date of the licensee during the second year of a two-year term. To renew an unexpired license, the licensee shall, before the time at which the license would otherwise expire, apply for renewal on a form prescribed by the dental hygiene board and pay the renewal fee prescribed by this article.